This 4-in-1 refractometer is a reliable handheld tool designed for testing AdBlue, engine coolants, antifreeze, windshield washer fluids, and battery electrolytes. Built with Automatic Temperature Compensation (ATC), it ensures accurate readings across varying conditions. Ideal for automotive maintenance, workshops, and DIY car care, it provides quick, precise measurements to maintain vehicle performance and prevent engine damage. Main Features 4-in-1 Function – Tests AdBlue (urea), ethylene glycol, propylene glycol, windshield washer fluid, and battery electrolyte. Wide Measurement Ranges – Covers coolant freezing points, battery liquid density, and urea concentration. ATC Technology – Automatically adjusts for temperature variations (0–30°C) to ensure consistent accuracy. High Precision – Resolution up to 0.01 for battery fluid, 0.2% for AdBlue, and ±5°C for freezing points. Durable & Portable – Compact 16 × 4 cm design with lightweight build (129 g). Easy to Use – Clear scale for quick reading, manual calibration included. Specifications Model: Refractometer (4-in-1) Measuring Range: Auto Urea (AdBlue): 30–35% Ethylene Glycol (EG): -50°C ~ 0°C Propylene Glycol (PG): -50°C ~ 0°C Glass Water (CW): -40°C ~ 0°C Battery Fluid (BF): 1.10 ~ 1.40 KG/L Accuracy: ±0.1 Resolution: Urea: 0.2% Antifreeze: 5°C Glass Water: 5°C Battery Fluid: 0.01 Size: 16 × 4 cm Weight: 129 g ATC Range: 0°C ~ 30°C Packing List 1 × 4-in-1 Refractometer 1 × Pipette 1 × Mini Screwdriver 1 × Cleaning Cloth 1 × Protective Case 1 × User Manual